MIOX RIO Zuni Series User manual

MIOX RIO Zuni™ Operators Manual P/N: 102-00094-I Page 1
RIO Zuni™ Series On-Site
Generator 1.0 and 2.0
Installation, Operation, and Maintenance
Manual
1 December 2017

MIOX RIO Zuni™ Operators Manual
P/N: 102-00094-I Page 2
MIOX maintains a constant product improvement program that may affect design and/or
specifications. The company reserves the right to make these changes without prior notice or
liability. Portions of the MIOX OSGs are covered by U.S. Patent
Customer Service
5601 Balloon Fiesta Parkway NE, Suite A
Albuquerque, NM 87113
Phone: [phone]
Toll Free: 1.866.MIOX.HLP (1.866.646.9457)
FAX: [phone]
[e-mail]
www.MIOX.com
www.Matthey.com
International distributors and sales agents located worldwide

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CONTENTS
CONTENTS.............................................................................................................. 3
List of Figures.........................................................................................................4
List of Tables..........................................................................................................4
INTRODUCTION AND OVERVIEW............................................................................ 5
Regulatory Compliance ............................................................................................5
U. S. Environmental Protection Agency (US EPA) .....................................................5
List of Certifications..............................................................................................5
NSF International.................................................................................................5
State Approvals ...................................................................................................5
System Description .................................................................................................6
System Specifications..............................................................................................7
System Illustrations and Component Descriptions .......................................................8
INSTALLATION AND STARTUP.............................................................................. 15
In the Box.........................................................................................................15
What you need .....................................................................................................15
Tools for install ..................................................................................................16
Installation Location Requirements.......................................................................16
Connections .........................................................................................................16
Plumbing...........................................................................................................16
Electrical...........................................................................................................17
Installing the RIO Zuni...........................................................................................19
Startup Tips ......................................................................................................21
OPERATION AND MAINTENANCE.......................................................................... 22
Normal Operation..................................................................................................22
Interface elements .............................................................................................22
Communications ................................................................................................23
Troubleshooting....................................................................................................24
Fault Conditions.................................................................................................24
Resolving Software Faults ...................................................................................24
General Troubleshooting .....................................................................................25
Maintenance.........................................................................................................27
General Plumbing Checks....................................................................................27

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Changing Peristaltic Pump Tubes..........................................................................27
Cell Replacement ...............................................................................................28
APPENDICES ........................................................................................................ 32
Inline Pressure Reducer .........................................................................................33
Changing Pump Tubes ...........................................................................................34
Water Quality Guidelines........................................................................................40
Rio Zuni Spare Parts Identification/Ordering Guide....................................................41
List of Figures
Figure 1: RIO Zuni On-Site Generator (tabletop model) ..................................................6
Figure 2: Generic diagram of a RIO Zuni OSG with necessary components ........................8
Figure 3: RIO Zuni 2.0 lb OSG with labeled system components. Cover not shown...........11
Figure 4: RIO Zuni 2.0 lb OSG showing cells, thermowells, and I/O panels......................12
Figure 5: RIO Zuni OSG I/O panels with labeled components.........................................13
Figure 6: One of two level switches before being installed in an oxidant tank...................14
Figure 7: Inline Pressure Reducer assembly.................................................................14
Figure 8: Image showing all connections for full operation of the RIO Zuni OSG...............18
Figure 9: LED Indicator meanings ..............................................................................22
Figure 10: RIO Zuni OSG with system cover and screw locations....................................30
Figure 11: Internal Top View of Zuni Showing Cell Hour Reset Button Location. ...............31
List of Tables
Table 1: System Specifications ....................................................................................7
Table 2: Fault conditions descriptions .........................................................................24
Table 3: General troubleshooting approaches ..............................................................26
Table 4: Cell Replacement Tools Required ...................................................................28

MIOX RIO Zuni™ Operators Manual
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INTRODUCTION AND OVERVIEW
This manual is intended to provide basic installation, operation, and maintenance guidelines
for the operator of the RIO Zuni™ on-site generator (OSG). Variations between model types
may cause the images in this manual to not directly reflect the setup of every unit.
Properly operating and maintaining the system will increase cell life and overall system
performance. If you encounter problems or have questions not covered in this manual,
please contact MIOX Service at 1-888-646-9457.
Regulatory Compliance
U. S. Environmental Protection Agency (US EPA)
On-site generated oxidants are listed as a compliance technology for water disinfection. To
be listed as a compliance technology, the system must be cost effective and achieve
compliance with the regulated maximum contaminant levels (MCLs), and the operator must
be capable of reliably operating the technology. The on-site oxidant category was added to
this list in 1997 primarily based on independent research of MIOX technology.
List of Certifications
EPA Registration Number: 69723-NM-001
NSF International
MIOX maintains a policy of verification and compliance of MIOX technology for water
applications. The NSF Standard provides the criteria used to evaluate the public health
safety of materials, components, products, or systems that contact drinking water, drinking
water chemicals, or both. For details of specific NSF standards for specific MIOX equipment,
please consult with MIOX. NSF listings are also available through NSF International at (800)
NSF-Mark or their web site at www.nsf.org.
State Approvals
MIOX maintains a policy of obtaining state regulatory approval in all states where MIOX
equipment is installed and operated. MIOX has never been rejected for approval in any
state. For a complete list of states currently approving on-site oxidant technology, please
contact MIOX.

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System Description
The MIOX RIO Zuni system is an on-site mixed oxidant generator that creates mixed
oxidant solution from water, salt, and electricity. The system can create either 1.0 lb. or 2.0
lbs. of Free Available Chlorine (FAC) per day, depending on the model ordered. When
producing oxidant the RIO Zuni system is automatically controlled by a pair of level switches
inside the oxidant storage tank.
Mixed oxidant solution is a powerful hypochlorite-based disinfectant with improved biological
kill efficacy that achieves more rapid and thorough inactivation of a wide range of microbial
contaminants.
Figure 1: RIO Zuni On-Site Generator (tabletop model)

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System Specifications
RIO Zuni 1
RIO Zuni 2
Rated FAC Capacity
1.0 lbs/day
0.45 kg/day
2.0 lbs/day
0.9 kg/day
Salt Conversion (SCE)* 3.0 - 3.5 lb. salt/lb. FAC
3.0 - 3.5 kg salt/kg FAC
Energy Conversion (ECE)* 3.5 kW-hr/lb. FAC
7.7 kW-hr/kg FAC
FAC Concentration* 4,000 mg/L (+/- 1,000)
Salt Quality Requirement 99.5% NaCl or better^
Water Hardness 0-17 mg/L
Maximum Silica Limit 20 mg/L
Flow Rate#1.3 gph
4.9 lph
2.7 gph
10.2 lph
Electrical Service Requirement
+
(OSG Only)
110 VAC to 240 VAC, 1 ph, 2A,
50/60 hertz
110 VAC to 240 VAC, 1 ph, 4A,
50/60 hertz
Air Temperature Required
40°F to 110°F
4
°
C to 43
°
C
Recommended Feed Water
Temperature*
55°to 80°F
12
°
to 27
°
C
Allowable Feed Water
Temperature* 40° to 95° F
4° to 35° C
Feed Water Pressure@
1 - 75 psi
6.8 – 517 kPa
Approximate OSG Dimensions
(WxDxH)
20.75 x 15.66 x 13.5 inches
52.71 x 39.78 x 34.29 cm
Approximate OSG Weight
25 lbs
11.5 kg
Self-Cleaning YES
+For continued protection against risk of fire, replace fuse only with a fuse of the same type and current rating
*Performance may vary depending on salt quality, water quality, and water temperature.
^Refer to MIOX Salt Quality Guidelines for more details.
#Feed water flow rate is subject to +/- 15% variation.
@Feed water pressure for RO Kit and/or Integrated Brine Tank is 40-75 psi
Table 1 : System Specifications

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System Illustrations and Component Descriptions
Figure 2: Generic diagram of a RIO Zuni OSG with necessary components
RIO Zuni OSG
On-site mixed oxidant generator (OSG).
Water supply
Fresh water supply for the OSG. Runs through Inline Pressure Reducer assembly before
connecting to OSG.
Brine supply
Low-pressure supply of saturated brine to the OSG.
Oxidant Tank
Vented oxidant solution storage tank for OSG output.
Oxidant
Level Switch
Assembly
RIO Zuni
Hydrogen Vent
(must vent
outside)
Brine Tank
Inline Pressure Reducer
(connect to water supply)

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Hydrogen Vents
Upward-sloping piping connected to outside environment for venting potentially dangerous
hydrogen gas (See Hydrogen Safety White Paper).
Level Switch Assembly
Assembly of two level switches and a level switch cable. The level switches control the OSG
when installed in the oxidant tank. The 15’ cable connects the level switches to the OSG.
See Figure 2 for details. Note: The level switches are orientation-sensitive and must be
installed with the arrow pointing upward in order to function properly.
System Cover
A rigid plastic housing that covers and protects the key components of the RIO Zuni.
LCD Display
Visual Display with a cycling menu of system status and operational parameters. See Figure
3 for details.
LED Indicator
A multi-color LED which displays system status. See Figure 3 for details.
Electrical Enclosure
An actively-cooled aluminum box housing the control board, power supplies and other
electronic components of the RIO Zuni System. See Figure 3 for details.
Brine Pump
An automated peristaltic pump which controls the system’s brine flowrate and acts as a
check valve to prevent brine supply dilution. Capable of withstanding up to 10 PSI of
pressure. See Figure 3 for details.
Water Pump
An automated peristaltic pump which controls the overall system flowrate and acts as a
check valve to prevent oxidant from flowing into the water supply. Capable of withstanding
up to 10 PSI of pressure. See Figure 3 for details.
MIOX Zuni Electrolytic Cell
A proprietary electrolytic cell manufactured by MIOX produces 1.0 lbs of FAC per day of
runtime. 1 lb. RIO Zuni OSGs use one cell while 2 lb. RIO Zuni OSGs use two cells. See
Figure 4 for details.
Thermowells
In-line temperature sensors used to evaluate operational efficiency of the system. See
Figure 4 for details.
Electrical Back Panel
All of the unit’s electrical connections, including the power switch, system fuse, IEC power
receptacle, and connectors for the Level Switch Assembly, a USB jump drive, and an
Ethernet cable. See Figure 5 for details.

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Plumbing I/O Panel
3 barb fittings for connecting the water supply, brine supply and oxidant outlet. See Figure
5 for details.
Hydrogen Vent Kit
Kit of parts consisting of an oxidant tank inlet, drop tube assembly, warning labels and a
vent strainer. Refer to the Oxidant Tank Manual for details.
Inline Pressure Reducer Kit
Three (3) piece assembly to reduce line pressure to an appropriate pressure for the OSG.
Kit has a female ¾” NPT inlet connection. See Figure 7 and Appendices for details.
Integrated Brine Tank (Optional)
Optional integrated tank with automatic brine generation system designed explicitly for the
RIO Zuni. See Integrated Brine Tank Manual for installation and operation.
NOTE: For items not listed above see the appendices and
Documentation Kit. Additional items may include, but are not limited
to the oxidant tank, hydrogen vent, oxidant pump, water heater and
water chiller. Contact MIOX for additional details on available options.

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Figure 3: RIO Zuni 2.0 lb. OSG with labeled system components.
(System cover not shown)
LCD Display
LED
Indicator
Water
Pump
Brine Pump
Electrical
Enclosure
Check
Valve

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Figure 4: RIO Zuni 2.0 lb. OSG showing cells, thermowells, and I/O panels
Electrical Back
Panel
Thermowells
(T-shaped elements in
plumbing line)
2 MIOX RIO Zuni
Electrolytic Cells
Plumbing I/O

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Figure 5: RIO Zuni OSG I/O panels with labeled components
Power
Entry
Module
USB Port
for data
logging
Ethernet Port
Fuse
Holder
ON/OFF
Switch
Oxidant
Outlet
Water
Inlet
Brine Inlet
Level Switch
Assembly

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Figure 6: One of two level switches before being installed in an oxidant tank
Figure 7: Inline Pressure Reducer assembly

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INSTALLATION AND STARTUP
The RIO Zuni OSG has been factory tested and must be properly installed per the
instructions in this manual.
SAFETY PRECAUTIONS AND WARNINGS
Ensure that the facility and the installation are in conformance with all codes
and standards.
Please refer to the MIOX Hydrogen Safety White Paper or your local authority
having jurisdiction for more information.
A liquid barrier system is mandatory. Ensure that all hydrogen vent lines
slope towards the oxidant tank.
Ensure that no valves, drop legs, or P-traps are in the hydrogen vent lines.
Do NOT cross connect vent lines.
Ensure that brine and oxidant tanks are labeled properly.
Disconnect power before working on the system. Do not reconnect the power
to the rear panel until installation is complete.
All MIOX systems require a good earth ground. A neutral is not a substitute
for a proper earth ground. Electrical wiring to all MIOX systems should be
performed by a certified electrician.
In the Box
1) RIO Zuni OSG
2) RIO Zuni Quickstart Guide
3) RIO Zuni Installation, Operation, and Maintenance Manual
4) Documentation Kit
5) Power Cord
6) Standard Parts Kit
a. Level Switch Assembly (comes pre-installed if an Oxidant Storage Tank was
ordered from MIOX)
b. Tubing and hose clamps
7) Integrated Brine Tank (if ordered)
8) Oxidant Storage Tank (if ordered)
9) Inline Pressure Reducer Kit
10)Hydrogen Vent Kit (comes partially pre-installed if an Oxidant Storage Tank was
ordered from MIOX)
What you need
To install the MIOX RIO Zuni, you need:
Safety

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1) MIOX RIO Zuni OSG
2) 5 foot by 5 foot indoor environment
3) 110-240 VAC 10A circuit with standard grounded wall plug
4) Saturated Brine Supply (see MIOX Salt Quality Guidelinesfor salt
specifications)
5) Fresh Water Supply (see Appendices for Water Quality Guidelines)
6) Oxidant Storage Tank with Hydrogen Venting (see Hydrogen Safety White
Paper for details)
7) Tubing and hose clamps (provided with OSG)
8) Level Switch Assembly (provided with OSG)
9) Power Cord (provided with OSG)
Tools for install
The MIOX RIO Zuni can be installed without any tools, although MIOX recommends using a
pair of pliers to tighten the hose clamps on the plumbing I/O panel.
Refer to the Integrated Brine Tank Manual for tools needed to install the Integrated
Brine Tank.
Refer to the Oxidant Tank Manual for tools needed to install the Level Switch Assembly.
Installation Location Requirements
The RIO Zuni OSG must be installed indoors on a flat level surface approximately 5 feet long
by 5 feet wide (1.52m by 1.52m). The ambient air temperature at the installation location
must be between 40°F (5°C) and 110°F (43°C). Additional space may be required for the
water, brine, and oxidant tanks. MIOX recommends placing the OSG and tank near an
available drain for ease of draining the tank or in case of minor overflows. Additionally,
MIOX recommends placing the RIO Zuni near an external wall for ease of hydrogen venting
as described in the Hydrogen Safety White Paper.
NOTE: Failure of the system that can be traced to improper
temperature conditions is not covered under the MIOX warranty.
Connections
Plumbing
The RIO Zuni has three barbed plumbing connections on the plumbing I/O panel: water
inlet, brine in, and oxidant out. The ¼” barbed water inlet must be connected to the
appropriate location on the included Inline Pressure Reducer Kit. The ¼” barbed brine inlet
must be connected to an unpressurized saturated brine supply.
If using the integrated brine tank with the RIO Zuni OSG, the water and brine inlets
will connect to the labeled water and brine outlets on the integrated brine/water
tank. Please refer to the Integrated Brine Tank Manual for more details.

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The 3/8” barbed oxidant outlet must be connected to an oxidant tank and a hydrogen vent
line. All barb fittings must be secured with the included hose clamps.
Only supply the RIO Zuni OSG brine (fully-saturated salt water) and fresh
water. Feeding other solutions instead of brine and water can cause severe
damage to the equipment or operator. Follow MIOX Salt Guidelines for salt
quality used in operating on-site generation equipment.
For direct injection applications, the RIO Zuni OSG can inject into a maximum
of 10PSI.
Electrical
The RIO Zuni requires only power and level switch connections for normal operation. The
included 10 foot power cord connects the system to 110-120 VAC and should be connected
to the standard IEC receptacle on the electrical back panel. For a 220-240 VAC connection,
replace the supplied power cord with a 10A rated 220VAC IEC Cable (220VAC cable not
provided by MIOX).
All RIO Zuni OSG systems ship with a pre-installed 2A or 4A fuse, depending on model. A
spare fuse is also included with the unit.
NOTE: Failure of the system that can be traced to a poor power source
is not covered under the MIOX warranty.
The level switches should be installed in the oxidant tank as described in the GA drawing
or Oxidant Tank Manual. The level switch cable is keyed so there is only one orientation
that matches the connectors on the back panel. Without level switches plugged in, the OSG
will never operate and instead will remain in ‘Standby’ mode.
All MIOX systems require a good earth ground. A neutral is not a substitute for
an earth ground. Electrical wiring to all MIOX units should be wired on a
separate circuit from other power devices, like pumps, etc. MIOX cannot be
held responsible for systems wired improperly that do not meet UL or National
Electrical Code (NEC) requirements. If the system is improperly grounded, the
MIOX warranty is void. If a local code requires a GFI (Ground Fault
Interrupter) circuit breaker, it is the responsibility of the customer to install
the GFI to meet local code requirements.
Safety
Safety

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Figure 8: RIO Zuni Connections.

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Installing the RIO Zuni
1) Unpack The Boxes
Unpack the RIO Zuni OSG and all included components.
2) Position the OSG
Tabletop configuration: Place the RIO Zuni OSG on a flat, level surface.
Integrated Brine Tank configuration: Place the RIO Zuni OSG on the integrated
brine tank by following instructions in the Integrated Brine Tank Manual.
3) Install Inline Pressure Reducer
Following the instructions in the Appendices for installing the Inline Pressure
Reducer, connect the water source to the water inlet of the OSG through the Inline
Pressure Reducer.
4) Connect Water Source
Tabletop configuration:
Connect water source to brine source.
Integrated Brine Tank configuration:
Connect pressurized water source to the brine tank using the 1/4” diameter LDPE
tubing. Secure with hose clamps. Leave valves closed.
5) Connect Water & Brine Inputs to OSG
Use the smaller diameter clear vinyl tubing to connect the water and brine feeds to
the OSG. Secure with hose clamps. Leave valves closed.
6) Load Salt
Load the brine tank with salt. If Integrated Brine Tank was ordered from MIOX,
follow instructions in the Integrated Brine Tank Manual.
NOTE: Only use salt that meets or exceeds the salt quality
specifications in the MIOX Salt Guidelines.
7) Connect Oxidant Tank
Connect the oxidant outlet to the oxidant tank using the larger diameter clear vinyl
tubing and hose clamps. If Oxidant Storage Tank was ordered, follow installations
instructions in the Oxidant Tank Manual.
8) Install Level Switch
Plug the level switch assembly cable into the electrical I/O panel of the OSG. Follow
installations instructions in the Oxidant Tank Manual for the Level Switch
Assembly.

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NOTE: Oxidant tank level switches must be installed correctly for the
system to operate.
9) Hydrogen Venting
Install hydrogen venting in the oxidant tank. Hydrogen must be vented outdoors.
Follow the Hydrogen Vent Kit instructions in the Oxidant Tank Manual and MIOX
Hydrogen Safety White Paper.
10)Attached Power Cord
Attach power cord to IEC on the back panel of OSG. Connect to 220-240 VAC. For a
220-240 VAC connection, replace the supplied power cord with a 10A rated 220VAC
IEC Cable (220VAC cable not provided by MIOX).
11)Open Valves on OSG
Open the water and brine feed valves on the OSG.
12)Open Water Source Valve
Open the facility water source valve.
13)Brine Saturation
Wait 30 minutes to 1 hour to allow brine to fully saturate before turning system on.
14)Turn System On
Turn on the unit by switching the power switch on the back panel. The RIO Zuni will
enter into a priming cycle. RIO Zuni will automatically start producing oxidant after
the system has completed the priming cycle.
NOTE: Visually verify that water and brine are being delivered to the
plumbing I/O panel on the back of the OSG.
If water and/or brine are not visibly entering the OSG at the end of the priming
cycle, restart the priming cycle by turning the unit off, waiting 5 seconds, then
turning the unit on again. Wait for the priming cycle to end and then repeat this
process until both water and brine are successfully delivered to the plumbing I/O
panel. Refer to the troubleshooting guide located within this manual if system does
not start after priming cycle.